<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>联系我们</title>
</head>
<body>
    <h1>联系我们</h1>
    <button onclick="navigateHistory(-2)">返回主页</button>
    <button onclick="navigateHistory(-1)">返回关于我们</button>
    <button onclick="history.back()">后退一页</button>
    <script>
        function navigateHistory(steps) {
            history.go(steps);
        }
    </script>
</body>
</html>